Safety-lock



UNITED SIAES PATIENT FIIIQE.

LINUS YALE, JR., OF NENPORT, NEV YORK.-

SAFETY-LOCK.

Specification of Letters Patent No. 9,497, dated December 21, 18595;

To all w/zo'm t may concern.'

Be it known that I, LINUS YALE, Jr., of Newport, in the county of Herkimer and State of New York, have invented a new and Improved Mode of Constructing Locks for Banks, Doors of Vaults, Safes, &c.; and I do hereby declare that the following is a full and exact description of the said invention, reference being had to the drawings accompanying this specification.

To enable others skilled in the art to construct and use my lock I will proceed to describe its form and operation.

Tithin the case A, is fitted to slide the bolt B, having notches c, a, in which the cogs on the wheel C, work to move it, said wheel being held in position by the cover D, in which it is fitted to revolve. In performing a revolution said wheel moves the said bolt B, only one inch, the number of co-gs being limited to two which have the notches in the bolt while revolving one way in a position to strike them right on its return or counter-revolution. Said wheel being made to revolve at pleasure by means of the key E, which is furnished with a pin c, to hold in the notch (l, of the wheel.

The bolt B, is held outI when locked and in when unlocked by the stops e, e, e, which are just the length of the space between the ends or wings f, f, of the bolt, the projection g, in the case A, having a groove in which the stops lie and slide, always protruding either above or below said projection thereby intercepting the movement of the bolt except it is being unlocked regularly by the proper key as hereinafter described.

The stops e, e, e, are moved and held in place by the tumblers z, h, 7i, and springs z', i, z' therein inserted in such a manner that the ends overreach and clasp a projection on the stops as at y', the springs being suflicient to move and hold the stops in their uninterrupted and natural action. The tumblers 7i, L are borne downward by the springs 7c, 7c, c inserted in their edges as at l, when not sustained by the lever F, which is hung on the fulcrum pin m, projecting from the case. Said lever resting upon the wheel c. The cogs of which by revolving raise it and through it theI tumblers to their full height, in such a manner that the key hole in the center of each is in line with the hole in the wheel.

Attached to the bolt B, is a spring m, projecting a very little way beyond and in the rear of the extreme end of the bolt and immediately over the stops. rIhis spring is for the purpose of pressing together the stops e, e, e, to that degree that, when the bolt B, to-uches them their movement cannot be effected with trueness and certainty, by the springs e', z', 2' through which they are moved readily and truly in the ordinary action of the lock. The tension of the spring n, is regulated by the screw which fastens it to the bolt.

The projections 0, 0, on the bolt B, prevent its rising up by the act-ion of the spring n, by bearing against the inner surface of the cover D.

To unlock the lock (it being locked as seen in the drawings) the key is inserted while the wheel C, is turned with its cogs ZJ, raised under the lever F, thereby holding the tumblers up and in a position which will admit the key. The pin c, on the handle of the key enters the notch d, and vby turning to the left moves the cogs from under the lever and lets the tumblers fall upon the projections of the key-bit, which sustains them and through them and their intermediate springs, the stops at the precise height required to let the bolt pass over or across their ends, being driven by the beforementioned cogs Z9, b, which then resume their position under the lever and raise the tumblers thereby relieving the key which may be withdrawn, and also throwing the stops into a position to prevent the movement of the bolt until the proper key is again inserted. But in case the bolt is attempted by a burglar with a false key or other instrument, the first thing done is to move it against the stops preparatory to arranging them for its passage, which movement by the friction between the bolt and stops and the friction between the stops caused by the spring n, renders the proper adjustment of the stops impossible by the now uncertain action of the springs z', i, z'

. through which alone they are moved.

I claim` l. In combination with the tumblers or their equivalents constructed and connected respectively to stops in the manner or in an equivalent manner to that described in the specification and shown in the drawings at j, the spring n, the same being an additional device cooperating with the said tumblers and springs connected therewith in rendering the movements and positions of the stops to the highest degree uncertain, When an attempt is made to unlock the lock Without using the proper key.

2. I Claim the Wheel C, and the lever F, in Combination With the tumblers h, h, h constructed as before described or their equivalents, to raise While in one position, and support the tumblers so that the key hole shall be equal and smooth to rel0 eeive the key and then allow them to be stopped at proper heights on the key While a revolution is performed and the bolt moved by the Wheel, substantially as described.

LINUS YALE, JUN. Witnesses z GEO. H. HURLBUT, WILLIAM CHAPMAN. 

